100bb effective -
Hero opens CO to 2.4bb w/ QThh
SB 3bets ~10bb
Hero calls

Flop ~22bb
AsAd5h
SB checks, Hero Checks
Turn ~22bb
Jh
SB bets 11bb, Hero calls
River ~44bb
7h
SB checks, Hero ???

SB flop check is kinda suspect as I think this board should be cbet at very high frequency.
On turn he's likely betting all his flop traps and any air he elected to check. I think many players might even bet 66-TT here for value/protection. I figure I can call pretty much any bet short of a shove on river if I hit and be good against Ax, random Jx, and KK on heart rivers. My Q or T might even be good against 66-99 type stuff that he stabs on turn.

When he checks river I'm at a bit of a loss. On the one hand I'm very high up in my range here. On the other hand I do have a fair number of flushes on this river that most players auto-bet so this would be a good spot to go for a value checkraise with the ace high flush or some slowplayed full house. And I suspect more slowplays than most players have based on the flop check.

Thoughts on betting this river?
If we're not betting this admittedly great river, does this make my turn call a bad one?